Add constructors to all the event classes.

client/html/src/DeviceMotionEventWrappingImplementation.dart

Index: client/html/src/DeviceMotionEventWrappingImplementation.dart
diff --git a/client/html/generated/src/wrapping/_DeviceMotionEventWrappingImplementation.dart b/client/html/src/DeviceMotionEventWrappingImplementation.dart
similarity index 54%
rename from client/html/generated/src/wrapping/_DeviceMotionEventWrappingImplementation.dart
rename to client/html/src/DeviceMotionEventWrappingImplementation.dart
index 429788042f5b0a5d35866e188b1cfadab98086b6..84ea98dbaa21f1a708de1d6f61ddf0f14632a463 100644
--- a/client/html/generated/src/wrapping/_DeviceMotionEventWrappingImplementation.dart
+++ b/client/html/src/DeviceMotionEventWrappingImplementation.dart
@@ -2,10 +2,15 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// WARNING: Do not edit - generated code.
-
 class DeviceMotionEventWrappingImplementation extends EventWrappingImplementation implements DeviceMotionEvent {
-  DeviceMotionEventWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
+  DeviceMotionEventWrappingImplementation._wrap(ptr) : super._wrap(ptr);
+
+  factory DeviceMotionEventWrappingImplementation(String type,
+      [bool canBubble = false, bool cancelable = false]) {
+    final e = dom.document.createEvent("DeviceMotionEvent");
+    e.initEvent(type, canBubble, cancelable);
+    return LevelDom.wrapDeviceMotionEvent(e);
+  }
 
-  num get interval() { return _ptr.interval; }
+  num get interval() => _ptr.interval;
 }